<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>createRef</title>
  <style>
  </style>
</head>

<body>
  <!-- 准备好一个容器 -->
  <div id="test1"></div>

  <!-- 引入React核心库 -->
  <script type="text/javascript" src="../js/react.development.js"></script>
  <!-- 引入react-dom,用于支持react操作DOM -->
  <script type="text/javascript" src="../js/react-dom.development.js"></script>
  <!-- 引入babel，用于把jsx转为js -->
  <script type="text/javascript" src="../js/babel.min.js"></script>
  <!-- 引入prop-types,用于对prop进行限制 -->
  <script type="text/javascript" src="../js/prop-types.js"></script>

  <script type="text/babel">
    // 创建组件
    class Demo extends React.Component {
      // React.createRef调用后可以返回一个容器，该容器可以存储被ref所标识的节点，该容器是“专人专用”的
      inputRef1 = React.createRef()
      inputRef2 = React.createRef()
      showData1 = () => {
        alert(this.inputRef1.current.value)
      }
      showData2 = () => {
        alert(this.inputRef2.current.value)
      }
      render () {
        return (
          <div>
            <input ref={this.inputRef1} type="text" placeholder="点击按钮提示数据" />
            <button onClick={this.showData1}>点我提示左侧数据</button>
            <input onBlur={this.showData2} ref={this.inputRef2} type="text" placeholder="失去焦点提示数据" />
          </div>
        )
      }
    }
    // 渲染组件到页面
    ReactDOM.render(<Demo />, document.getElementById('test1'))
  </script>
</body>

</html>